<style>
this {
  height: 44px;
  line-height: 44px;
  border-bottom: 1px solid #ddd;
  text-align: center;
  font-size: 20px;
}
.left-btn {
  float: left;
  height: 44px;
  width: 44px;
}
.right-btn {
  float: right;
  height: 44px;
  width: 44px;
}
</style>
<div>
  <div v-if="subPage" class="left-btn icon icon-back" v-on:click="goBack"></div>
  <div class="right-btn icon icon-more" v-on:click="alertShare"></div>
  {{title}}
</div>